40007523 has 4 divisors (see below), whose sum is σ = 53343368. Its totient is φ = 26671680.

The previous prime is 40007519. The next prime is 40007533. The reversal of 40007523 is 32570004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40007523 - 2² = 40007519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40007523.

It is not an unprimeable number, because it can be changed into a prime (40007533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6667918 + ... + 6667923.

It is an arithmetic number, because the mean of its divisors is an integer number (13335842).

Almost surely, 2^40007523 is an apocalyptic number.

40007523 is a deficient number, since it is larger than the sum of its proper divisors (13335845).

40007523 is a wasteful number, since it uses less digits than its factorization.

40007523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13335844.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 40007523 is about 6325.1500377461. The cubic root of 40007523 is about 342.0166282398.

Adding to 40007523 its reverse (32570004), we get a palindrome (72577527).

The spelling of 40007523 in words is "forty million, seven thousand, five hundred twenty-three".